Pafupi ndi njerwa zopangira magetsi

Mukamasankha njerwa zoyaka moto zowotchera moto, chisamaliro chiziperekedwanso kutentha ndi kutentha kwa mbali zosiyanasiyana za ng’anjo, ndipo zida zosiyanasiyana zimatha kusankhidwa.

Kutentha kwa chipinda choyaka moto, chomwe ndi zone I, ndi 1400 ~ 1600 ℃, ndipo njerwa za corundum zokhala ndi zotayidwa 90% zitha kugwiritsidwa ntchito; Kutentha kogwira ntchito kumtunda kwa ng’anjo, komwe ndi gawo lachiwiri, ndi 900 ~ 1000 ℃, chulucho chimakhala ndi ziphuphu zamadzimadzi, ndipo zotayidwa ndizoposa 75.% Za njerwa zapamwamba kwambiri, kutentha kogwirira ntchito pakati pa ng’anjo, yomwe ndi gawo lachitatu, ndi 900 ℃, ndipo mchere wosungunuka ndi alkali zimatsikira pansi pa ng’anjoyo, zimayambitsa kutupa kwakukulu. Njerwa yamtundu wa alumina (LZ-65) itha kugwiritsidwa ntchito; Chimodzimodzi pakati pa ng’anjo, mukakhala mchere wambiri wosungunuka muzinthu zoyaka, ndikosavuta kuyang’ana kutsetsereka, kukhala nthawi yayitali, ndipo ndikosavuta kulowerera m’malo opondereza. Ngati pali Na2CO3, dzimbiri ndi lalikulu kwambiri, ndiye kuti ndiloyipa kuposa pakati pamoto. Zida zowirira zokhala ndi porosity yotsika, monga zophatikizira zotsukira.